Even though they have regained access to their support center, the hacker still has a chance to use email spoofing and send emails to those Trezor users and try various hacking attempts like sending malware and asking them to download, or asking them to use new web portal which could be phishing and numerous more methods they may try. There are still a few percentage of people who might believe those emails and try those things.
This is exactly what has started to happen now. Check this thread for more information
[Warning] Trezor users are receiving fake emails with phishing links.. We knew from the beginning that if a hacker had the list of the users, he would make various scam attempts including sending emails and asking them to do various things. In this case, the hacker sends users an email to upgrade their network, otherwise, the users will lose their funds. LOL. What a lame excuse! I wish no one falls for this scam attempt. But as I said, we will never know if some average Joe who has a Trezor wallet may fall for this scam. I hope everyone stays safe and does not fall for it.